Display screen with a user interface



FIG. 1 is a front view of a display screen with a user interface showing our new design; and,

FIG. 2 is a front view of an alternate embodiment of a display screen with a user interface showing our new design.

The broken line showing of the display screen is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a display screen with a user interface, as shown and described. 